Causal monotonicity, omniscient foliations and the shape of space

Details Causal monotonicity, omniscient foliations and the shape of space Causal monotonicity, omniscient foliations and the shape of space

2001-08-03

arxiv.org/abs/gr-qc/0108014v1

Class.Quant.Grav. 18 (2001) 27-43

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, AMSTeX

Scientific paper

10.1088/0264-9381/18/1/303

What is the shape of space in a spacetime? One way of addressing this issue is to consider edgeless spacelike submanifolds of the spacetime. An alternative is to foliate the spacetime by timelike curves and consider the quotient obtained by identifying points on the same timelike curve. In this article we investigate each of these notions and obtain conditions such that it yields a meaningful shape of space. We also consider the relationship between these two notions and find conditions for the quotient space to be diffeomorphic to any edgeless spacelike hypersurface. In particular, we find conditions in which merely local behavior (being spacelike) combined with the correct behavior on the homotopy level guarantees that a putative shape of space really is precisely that.

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